US8797684B1

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Publication number: US8797684B1
Application number: US13/331,020
Authority: US
Inventors: Ut Tran; Zhigang Bai; Kevin K. Lin
Original assignee: Western Digital Fremont LLC
Current assignee: Western Digital Technologies Inc
Priority date: 2011-12-20
Filing date: 2011-12-20
Publication date: 2014-08-05

Abstract

A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a write pole and a coil. The write pole has a pole tip and a yoke. The coil energizes the write pole and includes a plurality of turns. A turn of the plurality of turns has a first portion and a second portion. The first portion has a first length in a stripe height direction substantially perpendicular to the ABS. The second portion has a second length in the stripe height direction. The second length is greater than the first length and extends at least to at least one adjacent turn.

Description

BACKGROUND

Disk drives typically use heads residing on sliders to read from and write to the magnetic media. A head typically includes a read transducer and a write, or recording transducer.FIGS. 1-3 depict various conventional

magnetic recording transducers

10,10′, and10″, respectively. The

magnetic recording transducers

10,10′, and10′ include

18,18′,18″. Theconventional write transducer10 typically utilizes photoresist as theinsulator16. In addition, thereturn shield18 is typically formed of two separate pieces-18A and18B. Theconventional write transducer10′ uses a single piece, dome-shaped shield18′. Photoresist is still used as theinsulator16′. Thewrite transducer10″ has an insulator such as alumina conformally deposited around the turns of thecoins12″. Asingle piece shield18″ may also be used. Further, the

coils

12,12′, and12″ each have three turns. Typically, three turns are required to obtain a sufficient field in the yoke of thepole14.

The trend in magnetic recording is to higher densities and higher data rates. For higher data rates, additional requirements may be placed on the

conventional write transducer

10,10′, and10″. For example, a shorter yoke length is generally desired. A shorter yoke length allows for faster reversals in the magnetic flux generated by thepole14. A shorter yoke length also corresponds to a smaller distance available for the

coils

12,12′, and12″. However, the

conventional transducers

10,10′, and10″ can only be shrunk to a limited extent because of the coil cross-section required to support the desired current and insulation between the turns. For example, the length of the yoke for the

transducers

10,10′, and10″ is typically 5 μm or longer. In addition to a shorter yoke length, reduced pole tip protrusions are also desired. Pole tip protrusion occurs when a portion of the transducer projects outward from the ABS. For theconventional write transducer10, a permanent pole tip protrusion generally exists due to the two piece shield. For the

transducers

10 and10′, thermal protrusion may occur due to the large coefficient of thermal expansion of the photoresist used for the

insulators

16 and16′. Although thepole10″ does not use photoresist and may use a single piece shield, theinsulator16″ is not smooth above the turns of theupper coil12″. Theshield18″ is conformal with theinsulator16″ and thus also exhibits the wiggles sown inFIG. 3. These nonuniformities adversely affect the conduction of flux by theshield18″ at high data rates. This is also undesirable. Thus, the

write transducers

10,10′, and10″ may be unsuitable for use at higher data rates.

Accordingly, what is needed is a system and method for providing improved write transducers that may be used at higher data rates.

BRIEF SUMMARY OF THE INVENTION

A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a write pole and a coil. The write pole has a pole tip and a yoke. The coil energizes the write pole and includes a plurality of turns. A turn of the plurality of turns has a first portion and a second portion. The first portion has a first length in a stripe height direction substantially perpendicular to the ABS. The second portion has a second length in the stripe height direction. The second length is greater than the first length and extends at least to at least one adjacent turn of the plurality of turns.

BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS

FIG. 1 is a diagram of a side view of a conventional write transducer.

FIG. 2 depicts a side view of a conventional write transducer.

FIG. 3 depicts a side view of a conventional write transducers drive.

FIG. 4 depicts a side view of an exemplary embodiment of a write transducer.

FIG. 5 depicts a side view of another exemplary embodiment of a write transducer.

FIG. 6 depicts a side view of another exemplary embodiment of a write transducer

FIG. 7 depicts a side view of another exemplary embodiment of a write transducer

FIG. 8 depicts a side view of another exemplary embodiment of a write transducer

FIG. 9 depicts a side view of another exemplary embodiment of a write transducer

FIG. 10 depicts a side view of another exemplary embodiment of a write transducer

FIG. 11 is a flow chart depicting an exemplary embodiment of a method for providing a write transducer.

FIG. 12 is a flow chart depicting an exemplary embodiment of a method for providing a write coil in a write transducer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 4 depicts a side view of a portion of an exemplary embodiment of a disk drive. More specifically,FIG. 4 depicts a portion of awrite transducer100. Thewrite transducer100 may be part of a merged head that also includes a read transducer and which resides in a disk drive. For simplicity, components are omitted. In addition, for clarity,FIG. 4 is not drawn to scale.

Themagnetic transducer100 has awrite pole101 as well as

coils

120 and130. Thewrite pole101 includesmain pole102 andauxiliary pole106. Also shown areinsulator104,shield108, andpedestal110. Thepole101 has a pole tip opposite to thepedestal110 and a yoke which lies between the

coils

120 and130. Thepole101 may be a perpendicular magnetic recording (PMR) pole. Thus, thetransducer100 may be a PMR transducer. However, thepole101 and transducer may be used in other writers. For example, thetransducer100 may be an energy assisted magnetic recording (EAMR) transducer. In such a case, optics (not shown) are typically included. Further, a read transducer may also be coupled with thewrite transducer100. Theshield108 is a single piece. However, in other embodiments, theshield108 may have multiple pieces.

The

coils

120 and130 are conductive and carry a write current used to energize the pole. In some embodiments, the

coils

120 and130 may be separate, pancake coils. In other embodiments, the

coils

120 and130 form a single helical coil. In addition, although a single layer of

coils

120 and130 are shown on either side of thepole101, multiple layers of coils could be provided. Theinsulator104 may include several different insulators and/or may be formed in multiple fabrication steps. Theinsulator104 is nonmagnetic and insulates the

turns

132,134, and136 of thecoil130. Another, analogous insulator may be used to insulate the

turns

122,124, and126 of thecoil120. Theinsulator104 may be photoresist. However, in other embodiments, theinsulator104 may include other materials. For example, aluminum oxide may be used for theinsulator104. However, because of the configuration of thecoil130, the dome shape of theinsulator104 may be maintained even if aluminum oxide is used.

Thecoil120 includes

turns

122,124, and126. Similarly, thecoil130 includes

turns

132,134, and136. In another embodiment, thecoil130 and/or120 may have only two turns. In such an embodiment, either theturns122/132 and124/134 or theturns124/134 and126/136 would be included. Thus, theturn124/134 would be present in either embodiment. One of the

turns

124 and134 for each

coil

120 and130, respectively, has a first portion and a second portion. The first portion has a first length in the stripe height direction. As can be seen inFIG. 4, the stripe height direction is substantially perpendicular to the ABS. The first portion of the

turn

124 and134 is the lower portion inFIG. 4. The second portion of the

coils

124 and134 has a second length in the stripe height direction that is greater than the first length. This second portion is the top of the “T” of

coils

124 and134 inFIG. 4. This portion is longer than the first portion and extends at least to at least one

adjacent turn

122 or126, or132 and136. In the embodiment shown, the top of the “T” extends approximately half-way across the adjacent turns122,126,132, and136. However, in other embodiments, the portion of thecoil124/134 that is longer in the stripe height direction may extend a different amount. Further, a “T” shape need not be used. Other shapes that may be used include but are not limited to an inverted-T, an L, an inverted-L, an “I” and a trapezoid. Further, other shapes might be used. The turns124 and134 depicted are symmetric. In other embodiments, theturn124 and/or134 may not be symmetric. For example, the horizontal portion of the “T” need not be centered over the vertical portion. In addition, the edges of the

turns

124 and134 are shown as straight. Thus, the first and second portions of the

turn

124 and134 have rectangular cross sections. However, in other embodiments, the sides of theturn124 and/or134 need not be straight. For example, the sides may be curved. For an I-shaped turn, there may be two portions that are longer and extend to a neighboring turn. In general, the longer, second portion of the

coil

124 or134 is desired to be above or below the plane of the remaining turns122,126,132, and136 as this portion of the

coil

124 or134 extends over neighboring turn(s). Also in the embodiment shown, both

coils

120 and130 have a

turn

124 and134, respectively, which extends over a neighboring turn. However, in other embodiments, only one of the

coils

120 or130 might have such a turn. Further, if multiple layers of coils are provided, one or more of the layers may include such a

turn

124 or134.

As can be seen inFIG. 4, the thinner portion of theturns124 and134 (e.g. the vertical portion of the T) is thinner than the remaining turns122 and126 and134 and136, respectively. In addition the insulation between the

turns

122,124, and126 and between the

turns

132,134, and136 may be thin. For example, for some insulators, the distance between the

turns

122,124, and126 and/or132,134 and136 may be as low as 0.1 micron. As a result, the length of the

coils

120 and130 in the stripe height direction may be reduced while the current carrying ability of the

coils

120 and130 may be maintained. For example, in some embodiments, thecoil120 and/or130 extend not more than 4.5 μm in the stripe height direction. Thus, the yoke of thepole101 may be not more than 4.5 μm. In some embodiments, the yoke length is not more than 3.5 μm.

Themagnetic transducer100 may have improved performance at high data rates. Because of the configuration of the

turns

124 and134, the

coils

120 and130 may occupy less space in the stripe height direction. As a result, the yoke may be shorter. The response time of thepole101 may thus be improved. In addition, theinsulator104 may be an insulator such as aluminum oxide while maintaining the smooth dome shape that tracks the top of thecoil130. Because a low coefficient of thermal expansion insulator such as aluminum oxide may be used while maintaining the smooth profile of theshield108, thewrite transducer100 may be less subject to thermal protrusions. Further, theshield108 may be formed from a single piece. Thus, protrusions may be further limited. In addition, the bottom surface of the

turns

124 and134 is slightly higher than the bottom surfaces of the

turns

122 and126 and the

turns

132 and136, respectively. Consequently, thecoils120/130 may be formed by providing theturns122/132 and126/136, depositing an insulating layer, then providing the remainingturn124/134. Thus, fabrication of the

coils

120 and130 may be relatively simple. Note, however, that in other embodiments, other methods may be used and other relationships between the bottoms of the

turns

122,124, and126 and the

turns

132,134, and136 may be possible.

FIG. 5 depicts a side view of an exemplary embodiment of amagnetic recording transducer100′. For simplicity,FIG. 5 is not to scale. Themagnetic transducer100′ is analogous to themagnetic transducer100. Consequently, analogous components are labeled similarly. Themagnetic write transducer100′ thus includes awrite pole101′ having amain pole102′ andauxiliary pole106′,insulator104′, shield108′,pedestal110′, and coils120′ and130′ that are analogous to thewrite pole101 having themain pole102 andauxiliary pole106, theinsulator104, theshield108, thepedestal110, and the

coils

120 and130, respectively.

Thecoils120′ and130′ are conductive and carry a write current used to energize the pole. In some embodiments, thecoils120′ and130′ may be separate, pancake coils. In other embodiments, thecoils120′ and130′ form a single helical coil. In addition, although a single layer ofcoils120′ and130′ are shown on either side of thepole101′, multiple layers of coils could be provided. Theinsulator104′ may include several different insulators and/or may be formed in multiple fabrication steps. Theinsulator104′ is nonmagnetic and insulates theturns132′,134′, and136′ of thecoil130′. Theinsulator104″ may be photoresist. However, in other embodiments, theinsulator104′ may include other materials. For example, aluminum oxide may be used for theinsulator104′. However, because of the configuration of thecoil130′, the dome shape of theinsulator104′ may be maintained. Another, analogous insulator may be used to insulate the turns of thecoil120′.

Thecoils120′ and130′ are analogous to the

coils

120 and130, respectively. Thecoil120′ includes turns122′,124′, and126′ analogous to the

turns

122,124, and126, respectively. Similarly, thecoil130′ includes turns132′,134′, and136′. Thus, theturns122′,124′,126′,132′,134′, and136′ may have an analogous configuration and operation to the

turns

122,124,126,132,134, and136, respectively. For example, the number of turns, the material(s) used, and other aspects of thecoils120′ and/or130′ may be varied as described above. However, in the embodiment shown, thecoils124′ and134′ are inverted “T”'s. More specifically, the longer portion that in the stripe height direction is at the bottom of theturns134′ and136′.

Themagnetic transducer100′ may share the benefits of themagnetic transducer100. Themagnetic transducer100′ may have improved performance at high data rates. Because of the configuration of theturns124′ and134′, thecoils120′ and130′ may occupy less space in the stripe height direction. As a result, the yoke may be shorter. The response time of thepole101′ may thus be improved. In addition, theinsulator104′ may be an insulator such as aluminum oxide while maintaining the smooth dome shape that tracks the top of thecoil130′. Because a low coefficient of thermal expansion insulator such as aluminum oxide may be used, thewrite transducer100′ may be less subject to thermal protrusions. Further, theshield108′ may be formed from a single piece. Thus, protrusions may be further limited. In addition, the bottom surface of theturns124′ and134′ is slightly higher than the bottom surfaces of theturns122′ and126′ and theturns132′ and136′, respectively. Consequently, thecoils120′/130′ may be formed by providing theturns122′/132′ and126′/136′, depositing an insulating layer, then providing the remainingturn124′/134′. Thus, fabrication of thecoils120′ and130′ may be relatively simple. However, in other embodiments, other methods may be used and other relationships between the bottoms of theturns122′,124′, and126′ and theturns132′,134′, and136′ may be possible.

FIG. 6 depicts a side view of an exemplary embodiment of amagnetic recording transducer100″. For simplicity,FIG. 6 is not to scale. Themagnetic transducer100″ is analogous to the

magnetic transducers

100 and100′. Consequently, analogous components are labeled similarly. Themagnetic write transducer100″ thus includes awrite pole101″ having amain pole102″ andauxiliary pole106″,insulator104″, shield108″,pedestal110″, and coils120″ and130″ that are analogous to thewrite pole101/101′ having themain pole102/102′ andauxiliary pole106/106′, theinsulator104/104′, theshield108/108′, thepedestal110/110′, and thecoils120/210′ and130/130′, respectively.

Thecoils120″ and130″ are conductive and carry a write current used to energize the pole. In some embodiments, thecoils120″ and130″ may be separate, pancake coils. In other embodiments, thecoils120″ and130″ form a single helical coil. In addition, although a single layer ofcoils120″ and130″ are shown on either side of thepole101″, multiple layers of coils could be provided. Theinsulator104″ may include several different insulators and/or may be formed in multiple fabrication steps. Theinsulator104″ is nonmagnetic and insulates theturns132″,134″, and136″ of thecoil130″. Theinsulator104″ may be aluminum oxide. However, in other embodiments, theinsulator104″ may include other materials including but not limited to photoresist.

Thecoils120″ and130″ are analogous to thecoils120/120′ and130/130′, respectively. Thecoil120″ includes turns122″,124″, and126″ analogous to theturns122/122′,124/124′, and126/126′, respectively. Similarly, thecoil130″ includes turns132″,134″, and136″. Thus, theturns122″,124″,126″,132″,134″, and136″ may have an analogous configuration and operation to theturns122/122′,124/124′,126/126′,132/132′,134/134′, and136/136′, respectively. For example, the number of turns, the material(s) used, and other aspects of thecoils120″ and/or130″ may be varied as described above. However, in the embodiment shown, theturn124″ is the same as the remaining turns122″ and124″. Thus, only thetop coil130″ has a T-shaped coil. In addition, in the embodiment shown, theshield108″ includes multiple parts. Further, theshield108″ does not have a dome shape. However, in another embodiment, theshield108″ would be a single piece and dome shaped.

Themagnetic transducer100″ may share the benefits of the

magnetic transducers

100 and100′. Themagnetic transducer100″ may have improved performance at high data rates. Because of the configuration of theturns134″, thecoil130″ may occupy less space in the stripe height direction. As a result, the yoke may be shorter. The response time of thepole101″ may thus be improved. In addition, theinsulator104″ may be an insulator such as aluminum oxide. Because a low coefficient of thermal expansion insulator such as aluminum oxide may be used, thewrite transducer100″ may be less subject to thermal protrusions. Further, in other embodiments, theshield108″ may be formed from a single piece and/or be dome shaped. Thus, protrusions may be further limited. In addition, the bottom surface of theturn134″ is slightly higher than the bottom surfaces of theturns132″ and136″, respectively. Consequently, fabrication of thecoil130″ may be simplified. However, in other embodiments, other methods may be used and other relationships between the bottoms of theturns132″,134″, and136″ may be possible.

FIG. 7 depicts a side view of an exemplary embodiment of amagnetic recording transducer100′″. For simplicity,FIG. 7 is not to scale. Themagnetic transducer100′″ is analogous to the

magnetic transducers

100,100′, and100″. Consequently, analogous components are labeled similarly. Themagnetic write transducer100′″ thus includes awrite pole101′″ having amain pole102′″ andauxiliary pole106′″,insulator104′″, shield108′″,pedestal110′″, and coils120′″ and130′″ that are analogous to thewrite pole101/101′/101″ having themain pole102/102′/102″ andauxiliary pole106/106′/106″, theinsulator104/104′/104″, theshield108/108′/108″, thepedestal110/110′/110″, and thecoils120/120′/120″ and130/130′/130″, respectively.

Thecoils120′″ and130′″ are conductive and carry a write current used to energize the pole. In some embodiments, thecoils120′″ and130′″ may be separate, pancake coils. In other embodiments, thecoils120′″ and130′″ form a single helical coil. In addition, although a single layer ofcoils120′″ and130′″ are shown on either side of thepole101′″, multiple layers of coils could be provided. Theinsulator104′″ may include several different insulators and/or may be formed in multiple fabrication steps. Theinsulator104′″ is nonmagnetic and insulates theturns132′″,134′″, and136′″ of thecoil130′″. Theinsulator104′″ may be aluminum oxide. However, in other embodiments, theinsulator104′″ may include other materials including but not limited to photoresist.

Thecoils120′″ and130′″ are analogous to thecoils120/120′/120″ and130/130′/130′, respectively. Thecoil120′″ includes turns122′″,124′″, and126′″ analogous to theturns122/122′/122″,124/124′/124″, and126/126′/126″, respectively. Similarly, thecoil130′″ includes turns132′″,134′″, and136′″ analogous to theturns132/132′/132″,134/134′/134″, and136/136′/136″. Thus, theturns122′″,124′″,126′″,132′″,134′″, and136′″ may have an analogous configuration and operation to theturns122/122′/122″,124/124′/124″,126/126′/126″,132/132′/132″,134/134′/134″, and136/136′/136″, respectively. For example, the number of turns, the material(s) used, and other aspects of thecoils120′″ and/or130′″ may be varied as described above. However, in the embodiment shown, theturn134′″ is the same as the remaining turns132′″ and134′″. Thus, only thebottom coil120′″ has a T-shaped coil. In addition, in the embodiment shown, theshield108′″ includes multiple parts. Further, theshield108″ does not have a dome shape. However, in another embodiment, theshield108″ would be a single piece and dome shaped.

Themagnetic transducer100′″ may share the benefits of the

magnetic transducers

100,100′ and100″. Themagnetic transducer100″ may have improved performance at high data rates. Because of the configuration of theturns124′″, thecoil120′″ may occupy less space in the stripe height direction. As a result, the yoke may be shorter. The response time of thepole101′″ may thus be improved. In addition, theinsulator104′″ may be an insulator such as aluminum oxide. Because a low coefficient of thermal expansion insulator oxide may be used, thewrite transducer100′″ may be less subject to thermal protrusions. Further, in other embodiments, theshield108′″ may be formed from a single piece and/or be dome shaped. Thus, protrusions may be further limited. In addition, the bottom surface of theturn124′″ is slightly higher than the bottom surfaces of theturns132′″ and136′″, respectively. Consequently, fabrication of thecoil120′″ may be simplified. However, in other embodiments, other methods may be used and other relationships between the bottoms of theturns122′″,124′″, and126′″ may be possible.

FIG. 8 depicts a side view of an exemplary embodiment of amagnetic recording transducer100″″. For simplicity,FIG. 8 is not to scale. Themagnetic transducer100″″ is analogous to the

magnetic transducers

100,100′,100″, and100′″. Consequently, analogous components are labeled similarly. Themagnetic write transducer100″″ thus includes awrite pole101″″ having amain pole102″″ andauxiliary pole106″″,insulator104″″, shield108″″,pedestal110″″, and coils120″″ and130″″ that are analogous to thewrite pole101/101′/101″/101′″ having themain pole102/102′/102″/102′″ andauxiliary pole106/106′/106″/106′″, theinsulator104/104′/104″/104′″, theshield108/108′/108″/108′″, thepedestal110/110′/110″/110′″, and thecoils120/120′/120″/120′″ and130/130′/130″/130′″, respectively.

Thecoils120″″ and130″″ are conductive and carry a write current used to energize the pole. In some embodiments, thecoils120″″ and130″″ may be separate, pancake coils. In other embodiments, thecoils120″″ and130″″ form a single helical coil. In addition, although a single layer ofcoils120″″ and130″″ are shown on either side of thepole101″″, multiple layers of coils could be provided. Theinsulator104″″ may include several different insulators and/or may be formed in multiple fabrication steps. Theinsulator104″″ is nonmagnetic and insulates theturns132″″,134″″, and136″″ of thecoil130″″. Theinsulator104″″ may be aluminum oxide. However, in other embodiments, theinsulator104″″ may include other materials including but not limited to photoresist.

Thecoils120″″ and130″″ are analogous to thecoils120/120′/120″/120′″ and130/130′/130″/130′″, respectively. Thecoil120″″ includes turns122″″,124″″, and126″″ analogous to theturns122/122′/122″/122′″,124/124′/124″/124′″, and126/126′/126″/126′″, respectively. Similarly, thecoil130″″ includes turns132″″,134″″, and136″″ analogous to theturns132/132′/132″/132′″,134/134′/134″/134′″, and136/136′/136″/136′″. Thus, theturns122″″,124″″,126″″,132″″,134″″, and136″″ may have an analogous configuration and operation to theturns122/122′/122″/122′″,124/124′/124″/124′″,126/126′/126″/126′″,132/132′/132″/132′″,134/134′/134″/134′″, and136/136′/136″/136′″, respectively. For example, the number of turns, the material(s) used, and other aspects of thecoils120″″ and/or130″″ may be varied as described above. However, in the embodiment shown, theturns132″″ and134′″ includes portions that are longer in the stripe height direction. More specifically, theturns132″″ and136″″ are inverted L-shapes. In other embodiments, thebottom coil120″″ may include inverted “L” shapes. Further, thecoil130″″ and/or thecoil120″″ may be “L” shaped (instead of inverted “L”-shaped). In addition, in the embodiment shown, theshield108″″ includes multiple parts. Further, theshield108′″ does not have a dome shape. However, in another embodiment, theshield108′″ would be a single piece and/or may be dome shaped.

Themagnetic transducer100″″ may share the benefits of the

magnetic transducers

100,100′,100″, and100′″. Themagnetic transducer100″″ may have improved performance at high data rates. Because of the configuration of theturns132″″ and136″″, thecoil130″″ may occupy less space in the stripe height direction. As a result, the yoke may be shorter. The response time of thepole101″″ may thus be improved. In addition, theinsulator104″″ may be an insulator such as aluminum oxide. Because a low coefficient of thermal expansion insulator oxide may be used, thewrite transducer100″″ may be less subject to thermal protrusions. Further, in other embodiments, theshield108″″ may be formed from a single piece and/or be dome shaped. Thus, protrusions may be further limited. In addition, the bottom surfaces of theturns132″″ and136″″ are slightly higher than the bottom surface of theturn134″″. Consequently, fabrication of thecoil130″″ may be simplified. However, in other embodiments, other methods may be used and other relationships between the bottoms of theturns132″″,134″″, and136″″ may be possible.

FIG. 9 depicts a side view of an exemplary embodiment of amagnetic recording transducer100′″″. For simplicity,FIG. 9 is not to scale. Themagnetic transducer100′″″ is analogous to the

magnetic transducers

100,100′,100″,100′″, and100″″. Consequently, analogous components are labeled similarly. Themagnetic write transducer100′″″ thus includes awrite pole101′″″ having amain pole102′″″ andauxiliary pole106′″″,insulator104′″″, shield108′″″,pedestal110′″″, and coils120′″″ and130′″″ that are analogous to thewrite pole101/101′/101″/101′″/101″″ having themain pole102/102′/102″/102′″/102″″ andauxiliary pole106/106′/106″/106′″/106″″, theinsulator104/104′/104″/104′″/104″″, theshield108/108′/108″/108′″/108″″, thepedestal110/110′/110″/110′″/110″″, and thecoils120/120′/120″/120′″/120″″ and130/130′/130″/130′″/130″″, respectively.

Thecoils120′″″ and130′″″ are conductive and carry a write current used to energize the pole. In some embodiments, thecoils120′″″ and130′″″ may be separate, pancake coils. In other embodiments, thecoils120″″ and130″″ form a single helical coil. In addition, although a single layer ofcoils120′″″ and130′″″ are shown on either side of thepole101′″″, multiple layers of coils could be provided. Theinsulator104′″″ may include several different insulators and/or may be formed in multiple fabrication steps. Theinsulator104′″″ is nonmagnetic and insulates theturns132′″″,134′″″, and136′″″ of thecoil130′″″. Theinsulator104′″″ may be aluminum oxide. However, in other embodiments, theinsulator104′″″ may include other materials including but not limited to photoresist.

Thecoils120′″″ and130′″″ are analogous to thecoils120/120′/120″/120′″/120″″ and130/130′/130″/130′″/130″″, respectively. Thecoil120′″″ includes turns122′″″,124′″″, and126′″″ analogous to theturns122/122′/122″/122′″/122″″,124/124′/124″/124′″/124″″, and126/126′/126″/126′″/126″″, respectively. Similarly, thecoil130′″″ includes turns132′″″,134′″″, and136′″″ analogous to theturns132/132′/132″/132′″/132″″,134/134′/134″/134′″/134″″, and136/136′/136″/136′″/136″″. Thus, theturns122″″″,124′″″,126′″″,132′″″,134′″″, and136′″″ may have an analogous configuration and operation to theturns122/122′/122″/122′″/122′″/,124/124′/124″/124′″/124′″,126/126′/126″/126′″/126″″,132/132′/132″/132′″/132′″,134/134′/134″/134′″/134″″, and136/136′/136″/136′″/136″″, respectively. For example, the number of turns, the material(s) used, and other aspects of thecoils120′″″ and/or130′″″ may be varied as described above. However, in the embodiment shown, theturns132′″″ and134″″ includes portions that are longer in the stripe height direction. More specifically, theturns132′″″ and136′″″ are I-shapes. In other embodiments, thebottom coil120′″″ may include “I” shapes. In addition, in the embodiment shown, theshield108′″″ includes multiple parts. Further, theshield108″″ does not have a dome shape. However, in another embodiment, theshield108″″ would be a single piece and/or may be dome shaped.

Themagnetic transducer100′″″ may share the benefits of the

magnetic transducers

100,100′,100″,100′″,100′″, and100′″″. Themagnetic transducer100′″″ may have improved performance at high data rates. Because of the configuration of theturns132′″″ and136″″, thecoil130′″″ may occupy less space in the stripe height direction. As a result, the yoke may be shorter. The response time of thepole101′″″ may thus be improved. In addition, theinsulator104′″″ may be an insulator such as aluminum oxide. Because a low coefficient of thermal expansion insulator oxide may be used, thewrite transducer100′″″ may be less subject to thermal protrusions. Further, in other embodiments, theshield108′″″ may be formed from a single piece and/or be dome shaped. Thus, protrusions may be further limited. In addition, the bottom surfaces of theturns132′″″ and136′″″ are slightly higher than the bottom surface of theturn134′″″. Consequently, fabrication of thecoil130′″″ may be simplified. However, in other embodiments, other methods may be used and other relationships between the bottoms of theturns132′″″,134′″″, and136′″″ may be possible.

FIG. 10 depicts a side view of an exemplary embodiment of amagnetic recording transducer200. For simplicity,FIG. 10 is not to scale. Themagnetic transducer200 is analogous to the

magnetic transducers

100,100′,100″,100′″,100″″, and100″″. Consequently, analogous components are labeled similarly. Themagnetic write transducer200 thus includes awrite pole201 having amain pole202 andauxiliary pole206,insulator204,shield208,pedestal210, and coils220 and230 that are analogous to thewrite pole101/101′/101″/101′″/101″″/101′″″ having themain pole102/102′/102″/102′″/102″″/102′″″ andauxiliary pole106/106′/106″/106′″/106″″/106′″″, theinsulator104/104′/104″/104′″/104″″/104′″″, theshield108/108′/108″/108′″/108″″/108′″″, thepedestal110/110′/110″/110′″/110″″/110′″″, and thecoils120/120′/120″/120′″/120″″/120′″″ and130/130′/130″/130′″/130″″/130′″″, respectively.

The

coils

220 and230 are conductive and carry a write current used to energize the pole. In some embodiments, the

coils

220 and230 may be separate, pancake coils. In other embodiments, the

coils

220 and230 form a single helical coil. In addition, although a single layer of

coils

220 and230 are shown on either side of thepole201, multiple layers of coils could be provided. Theinsulator204 may include several different insulators and/or may be formed in multiple fabrication steps. Theinsulator204 is nonmagnetic and insulates the

turns

232,234,236, and238 of thecoil230. Theinsulator204 may be aluminum oxide. However, in other embodiments, theinsulator104′″″204 may include other materials including but not limited to photoresist.

The

coils

220 and230 are analogous to thecoils120/120′/120″/120′″/120″″/120′″″ and130/130′/130″/130′″/130″″/130′″″, respectively. Thecoil220 includes

turns

222,224, and226 analogous to theturns122/122′/122″/122′″/122″″/122′″″,124/124′/124″/124′″/124″″/124′″″, and126/126′/126″/126′″/126″″/126′″″, respectively. Similarly, thecoil230 includes

turns

232,234, and236 analogous to theturns132/132′/132″/132′″/132″″/132′″″,134/134′/134″/134′″/134″″/134′″″, and136/136′/136″/136′″/136″″/136″″, respectively. Thus, the

turns

222,224,226,232,234, and236 may have an analogous configuration and operation to the turns of thecoils120/120′/120″/120′″/120″″/120′″″ and130/130′/130″/130′″/130″″/130′″″. For example, the number of turns, the material(s) used, and other aspects of thecoils220 and/or230 may be varied as described above. However, in the embodiment shown, thecoils20 and230 include

additional turns

228 and229 and

additional turns

238 and239, respectively. Of these, the

turns

228 and238 each includes portions that are longer in the stripe height direction. Thus,conventional turns222/232,226/236, and229/239 are interleaved withturns224/234 and228/238 that have section that overlap adjoining turns. In addition, in the embodiment shown, theshield208 includes multiple parts. Further, theshield208 does not have a dome shape. However, in another embodiment, theshield208 would be a single piece and/or may be dome shaped.

Themagnetic transducer200 may share the benefits of the

magnetic transducers

100,100′,100″,100′″,100″″, and100′″″. Themagnetic transducer200 may have improved performance at high data rates. Because of the configuration of the

turns

224,228,234, and238, the

coils

220 and230 may occupy less space in the stripe height direction. As a result, the yoke may be shorter. The response time of thepole201 may thus be improved. In addition, theinsulator204 may be an insulator such as aluminum oxide. Because a low coefficient of thermal expansion insulator oxide may be used, thewrite transducer200 may be less subject to thermal protrusions. Further, in other embodiments, theshield208 may be formed from a single piece and/or be dome shaped. Thus, protrusions may be further limited. In addition, the bottom surfaces of the

turns

224,228,234, and238 are slightly higher than the bottom surface of the

turns

222,226,229,232,236, and239. Consequently, fabrication of the

coils

220 and230 may be simplified. However, in other embodiments, other methods may be used and other relationships between the bottoms of the

turns

222,224,226,228,229,232,234,236,238, and239 may be possible. Further, the features of the

magnetic transducer

100,100′,100″,100′″,100″″,100′″″, and/or200 may be combined to achieve the desired transducer having improved high data rate recording.

FIG. 12 depicts an exemplary embodiment of amethod300 for fabricating a magnetic transducer analogous to the

transducers

100,100′,100″,100′″,100″″,100′″″, and/or200. Themethod300 is described in connection with thetransducer100. However, themethod300 may be used to fabricate any of the

transducers

100,100′,100″,100′″,100″″,100′″″, and/or200 as well as other analogous transducers. Although depicted as a flow of single steps, the steps of themethod300 may be performed in parallel. The steps of themethod300 may include substeps and/or may be interleaved.

Thewrite pole101 is provided, viastep302. Thecoils120 and/or130 are also fabricated, viastep304. Step304 may include various patterning and deposition steps to form the

coils

120 and130. Further, the

steps

302 and304 are typically interleaved. For example, thecoil120 is provided before themain pole202 andauxiliary pole204. In contrast, thecoil130 is provided after the main pole, but before lapping of thetransducer100. Fabrication of the magnetic transducer may then be completed, viastep306. For example, theshield108 may be formed. In addition, other structure(s) may be formed and thetransducer100 may be lapped to the ABS. Thus, themagnetic recording transducer100 may be formed. Similarly, thetransducers100′,100″,100′″,100″″,100′″″, and200 may be formed. Thus, the benefits of one or more of thetransducer100′,100″,100′″,100″″,100′″″, and/or200 may be attained.

FIG. 12 depicts an exemplary embodiment of amethod350 for the turns of a

coil

120,120′,120″,120′″,120″″,120′″,220′,130,130′,120″,130′″,130″″,130′″, and/or230′. Themethod350 is described in connection with thetransducer100 andcoil130. However, themethod350 may be used forother transducers100′,100″,100′″,100″″,100′″″, and/or200, and

other coils

120,120′,120″,120′″,120″″,120′″,220′,130,130′,120″,130′″,130″″,130′″, and/or230′. However, the structures formed before or after those described may differ. Further, although depicted as a flow of single steps, the steps of themethod350 may be performed in parallel. The steps of themethod350 may also include substeps, be combined, be performed in parallel and/or be interleaved.

An insulating layer is deposited on thepole102/104, viastep352. Step352 may include depositing one or more layers. The insulating layer deposited instep352 is part of theinsulator104. The coils that do not have an extended portion in the stripe height direction are provided, viastep354. Thus, for thecoil130, this means depositing

coils

132 and136. Step354 may thus including masking the insulating layer deposited instep352 then depositing the material(s) for the turns152 and156. The mask may then be lifted off. The conductive materials in the apertures remains, forming turns132 and136. Alternatively, conductive material(s) may be deposited, a mask having apertures where the conductive material(s) are desired to be removed is then formed. The exposed portion of the conductive materials may then be removed. Thus, turns132 and136 are formed.

Another insulating layer is deposited, viastep356. Thus, the

coils

132 and136 are covered in an insulator. The turn(s) which do have a portion that extends further in the stripe height direction are provided, viastep358. Step358 may include depositing the conductive material(s), providing a mask covering the region of theturn134, then removing the exposed portion of the conductive material(s). Alternatively, a mask having an aperture in the place of theturn134 may be provided, the conductive material(s) for theturn134 deposited, and then the mask removed. Thus, theturn134 is provided. Using themethod350, the

coils

120,120′,120″,120′″,120″″,120′″″,130,130′,130″,130′″,130″″,130′″″,220, and/or230 may be fabricated. Thus, the performance of thetransducer200 may be improved.

Claims

We claim:

1. A magnetic transducer having air-bearing surface (ABS) comprising:

a write pole having a pole tip and a yoke;

a coil for energizing the write pole and including a plurality of turns, a turn of the plurality of turns having a first portion and a second portion, the first portion having a first length in a stripe height direction substantially perpendicular to the ABS, the second portion having a second length in the stripe height direction, the second length being greater than the first length and extending to at least one adjacent turn of the plurality of turns; and

an additional coil for energizing the write pole and including an additional plurality of turns, the write pole residing between the additional coil and the coil, an additional turn of the additional plurality of turns having a first additional portion and a second additional portion, the first additional portion having a first additional length in the stripe height direction, the second additional portion having a second additional length in the stripe height direction, the second additional length being greater than the first additional length and extending to at least one adjacent additional turn of the additional plurality of turns.

2. The magnetic transducer ofclaim 1 wherein the coil and the additional coil form at least one helical coil.

3. The magnetic transducer ofclaim 1 wherein the coil and the additional coil are pancake coils.

4. The magnetic transducer ofclaim 1 wherein the first portion of the turn of the plurality of turns has a first substantially rectangular cross section and wherein the second portion of the first turn has a second substantially rectangular cross section.

5. The magnetic transducer ofclaim 1 wherein the first portion has a first edge and a second edge, the first edge being between the second edge and the ABS and wherein the second portion extends over the first edge and the second edge.

6. The magnetic transducer ofclaim 5 wherein the second portion is substantially centered on the first portion.

7. The magnetic transducer ofclaim 1 wherein the second portion extends at least one-half way across the adjacent turn in the stripe height direction.

8. The magnetic transducer ofclaim 1 wherein each of the plurality of turns has a bottom surface proximate to the pole and wherein the bottom surface of the turn is further from the pole than the bottom surface of the adjacent turn.

9. The magnetic transducer ofclaim 1 wherein the turn includes a third portion having a third length in the stripe height direction, the third length being greater than the first length.

10. The magnetic transducer ofclaim 9 wherein the first portion is between the second portion and the third portion.

11. The magnetic transducer ofclaim 1 wherein the yoke has a length of not more than 4.5 microns.

12. The magnetic transducer ofclaim 1 further comprising:

a shield, the coil residing between a portion of the shield and the write pole.

13. The magnetic recording transducer ofclaim 12 wherein the shield is a single piece shield.

14. The magnetic recording transducer ofclaim 1 further comprising:

an aluminum oxide insulator for electrically insulating the coil from the write pole and one the plurality of turns from another of the plurality of turns.

15. The magnetic transducer ofclaim 1 wherein the write pole is a perpendicular magnetic recording pole.

16. The magnetic transducer ofclaim 1 wherein the magnetic transducer is an energy assisted magnetic recording transducer.

17. A magnetic transducer having air-bearing surface (ABS) comprising:

a write pole including a pole tip and a yoke having a yoke length of not more than 4.5 microns;

a plurality of coils for energizing the write pole, the plurality of coils including a first coil and a second coil, the first coil including a plurality of turns, a turn of the plurality of turns having a first portion and a second portion, the first portion having a first length in a stripe height direction substantially perpendicular to the ABS, the second portion having a second length in the stripe height direction, the second length being greater than the first length and extending to at least one-half way across at least one adjacent turn of the plurality of turns in the stripe height direction, the second coil including an additional plurality of turns, the write pole residing between the second coil and the first coil, an additional turn of the additional plurality of turns having a first additional portion and a second additional portion, the first additional portion having a first additional length in the stripe height direction, the second additional portion having a second additional length in the stripe height direction, the second additional length being greater than the first additional length and extending to at least one-half way across at least one adjacent additional turn of the additional plurality of turns;

a one-piece shield proximate to the ABS, the first coil residing between a portion of the one-piece shield and the write pole;

an aluminum oxide insulator for electrically insulating the first coil from the write pole and one the plurality of turns from another of the plurality of turns.

18. A disk drive comprising:

a media,

a slider, and

a magnetic transducer coupled with the slider, the magnetic transducer having air-bearing surface (ABS), a write pole, a coil for energizing the write pole and an additional coil, the write pole having a pole tip and a yoke, the coil including a plurality of turns, a turn of the plurality of turns having a first portion and a second portion, the first portion having a first length in a stripe height direction substantially perpendicular to the ABS, the second portion having a second length in the stripe height direction, the second length being greater than the first length and extending to at least one adjacent turn of the plurality of turns, the additional coil for energizing the write pole and including an additional plurality of turns, the write pole residing between the additional coil and the coil, an additional turn of the additional plurality of turns having a first additional portion and a second additional portion, the first additional portion having a first additional length in the stripe height direction, the second additional portion having a second additional length in the stripe height direction, the second additional length being greater than the first additional length and extending at least to at least one adjacent additional turn of the additional plurality of turns.